Place the quinoa in a fine-mesh strainer and rinse under running water for about 2 minutes, or until the water runs clear; set aside to drain.
Heat 1/2 tablespoon olive oil in a large heavy-bottom skillet over medium-high heat.
Add the cubed chicken and diced smoked sausage to the hot pan and cook, stirring, until the chicken begins to brown, about 3–4 minutes.
Add the diced green pepper and minced onion and sauté with the meat until the onion softens, about 2–3 minutes more.
Stir in the minced garlic and cook for 30 seconds until fragrant.
Add the rinsed quinoa, chicken stock, Cajun seasoning, and diced tomatoes to the skillet; stir to combine and bring to a boil.
Reduce heat to medium-low, cover, and simmer for about 20 minutes, or until the quinoa is puffed and the liquid is absorbed.
Stir in the Worcestershire sauce and, if using, the hot sauce; fluff the quinoa with a fork and serve.